/*
 * Copyright 2014 Google Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "flatbuffers/flatc.h"

#include <list>

#include "bfbs_gen_lua.h"
#include "flatbuffers/util.h"

namespace flatbuffers {

const char *FLATC_VERSION() { return FLATBUFFERS_VERSION(); }

void FlatCompiler::ParseFile(
    flatbuffers::Parser &parser, const std::string &filename,
    const std::string &contents,
    std::vector<const char *> &include_directories) const {
  auto local_include_directory = flatbuffers::StripFileName(filename);
  include_directories.push_back(local_include_directory.c_str());
  include_directories.push_back(nullptr);
  if (!parser.Parse(contents.c_str(), &include_directories[0],
                    filename.c_str())) {
    Error(parser.error_, false, false);
  }
  if (!parser.error_.empty()) { Warn(parser.error_, false); }
  include_directories.pop_back();
  include_directories.pop_back();
}

void FlatCompiler::LoadBinarySchema(flatbuffers::Parser &parser,
                                    const std::string &filename,
                                    const std::string &contents) {
  if (!parser.Deserialize(reinterpret_cast<const uint8_t *>(contents.c_str()),
                          contents.size())) {
    Error("failed to load binary schema: " + filename, false, false);
  }
}

void FlatCompiler::Warn(const std::string &warn, bool show_exe_name) const {
  params_.warn_fn(this, warn, show_exe_name);
}

void FlatCompiler::Error(const std::string &err, bool usage,
                         bool show_exe_name) const {
  params_.error_fn(this, err, usage, show_exe_name);
}

std::string FlatCompiler::GetUsageString(const char *program_name) const {
  std::stringstream ss;
  ss << "Usage: " << program_name << " [OPTION]... FILE... [-- FILE...]\n";
  for (size_t i = 0; i < params_.num_generators; ++i) {
    const Generator &g = params_.generators[i];

    std::stringstream full_name;
    full_name << std::setw(16) << std::left << g.generator_opt_long;
    const char *name = g.generator_opt_short ? g.generator_opt_short : "  ";
    const char *help = g.generator_help;

    ss << "  " << full_name.str() << " " << name << "    " << help << ".\n";
  }
  // clang-format off

  // Output width
  // 12345678901234567890123456789012345678901234567890123456789012345678901234567890
  ss <<
    "  -o PATH                Prefix PATH to all generated files.\n"
    "  -I PATH                Search for includes in the specified path.\n"
    "  -M                     Print make rules for generated files.\n"
    "  --version              Print the version number of flatc and exit.\n"
    "  --strict-json          Strict JSON: field names must be / will be quoted,\n"
    "                         no trailing commas in tables/vectors.\n"
    "  --allow-non-utf8       Pass non-UTF-8 input through parser and emit nonstandard\n"
    "                         \\x escapes in JSON. (Default is to raise parse error on\n"
    "                         non-UTF-8 input.)\n"
    "  --natural-utf8         Output strings with UTF-8 as human-readable strings.\n"
    "                         By default, UTF-8 characters are printed as \\uXXXX escapes.\n"
    "  --defaults-json        Output fields whose value is the default when\n"
    "                         writing JSON\n"
    "  --unknown-json         Allow fields in JSON that are not defined in the\n"
    "                         schema. These fields will be discared when generating\n"
    "                         binaries.\n"
    "  --no-prefix            Don\'t prefix enum values with the enum type in C++.\n"
    "  --scoped-enums         Use C++11 style scoped and strongly typed enums.\n"
    "                         also implies --no-prefix.\n"
    "  --gen-includes         (deprecated), this is the default behavior.\n"
    "                         If the original behavior is required (no include\n"
    "                         statements) use --no-includes.\n"
    "  --no-includes          Don\'t generate include statements for included\n"
    "                         schemas the generated file depends on (C++ / Python).\n"
    "  --gen-mutable          Generate accessors that can mutate buffers in-place.\n"
    "  --gen-onefile          Generate single output file for C# and Go.\n"
    "  --gen-name-strings     Generate type name functions for C++ and Rust.\n"
    "  --gen-object-api       Generate an additional object-based API.\n"
    "  --gen-compare          Generate operator== for object-based API types.\n"
    "  --gen-nullable         Add Clang _Nullable for C++ pointer. or @Nullable for Java\n"
    "  --java-checkerframe    work Add @Pure for Java.\n"
    "  --gen-generated        Add @Generated annotation for Java\n"
    "  --gen-jvmstatic        Add @JvmStatic annotation for Kotlin methods\n"
    "                         in companion object for interop from Java to Kotlin.\n"
    "  --gen-all              Generate not just code for the current schema files,\n"
    "                         but for all files it includes as well.\n"
    "                         If the language uses a single file for output (by default\n"
    "                         the case for C++ and JS), all code will end up in this one\n"
    "                         file.\n"
    "  --gen-json-emit        Generates encoding code which emits Flatbuffers into JSON\n"
    "  --cpp-include          Adds an #include in generated file.\n"
    "  --cpp-ptr-type T       Set object API pointer type (default std::unique_ptr).\n"
    "  --cpp-str-type T       Set object API string type (default std::string).\n"
    "                         T::c_str(), T::length() and T::empty() must be supported.\n"
    "                         The custom type also needs to be constructible from std::string\n"
    "                         (see the --cpp-str-flex-ctor option to change this behavior).\n"
    "  --cpp-str-flex-ctor    Don't construct custom string types by passing std::string\n"
    "                         from Flatbuffers, but (char* + length).\n"
    "  --cpp-field-case-style STYLE Generate C++ fields using selected case style.\n"
    "                         Supported STYLE values:\n"
    "                          * 'unchanged' - leave unchanged (default);\n"
    "                          * 'upper' - schema snake_case emits UpperCamel;\n"
    "                          * 'lower' - schema snake_case emits lowerCamel.\n"
    "  --cpp-std CPP_STD      Generate a C++ code using features of selected C++ standard.\n"
    "                         Supported CPP_STD values:\n"
    "                          * 'c++0x' - generate code compatible with old compilers;\n"
    "                          * 'c++11' - use C++11 code generator (default);\n"
    "                          * 'c++17' - use C++17 features in generated code (experimental).\n"
    "  --cpp-static-reflection When using C++17, generate extra code to provide compile-time\n"
    "                          (static) reflection of Flatbuffers types.  Requires --cpp-std\n"
    "                          to be \"c++17\" or higher.\n"
    "  --object-prefix        Customise class prefix for C++ object-based API.\n"
    "  --object-suffix        Customise class suffix for C++ object-based API.\n"
    "                         Default value is \"T\".\n"
    "  --go-namespace         Generate the overriding namespace in Golang.\n"
    "  --go-import            Generate the overriding import for flatbuffers in Golang\n"
    "                         (default is \"github.com/google/flatbuffers/go\").\n"
    "  --raw-binary           Allow binaries without file_identifier to be read.\n"
    "                         This may crash flatc given a mismatched schema.\n"
    "  --size-prefixed        Input binaries are size prefixed buffers.\n"
    "  --proto                Input is a .proto, translate to .fbs.\n"
    "  --proto-namespace-suffix Add this namespace to any flatbuffers generated\n"
    "    SUFFIX                 from protobufs.\n"
    "  --oneof-union          Translate .proto oneofs to flatbuffer unions.\n"
    "  --grpc                 Generate GRPC interfaces for the specified languages.\n"
    "  --schema               Serialize schemas instead of JSON (use with -b).\n"
    "  --bfbs-filenames PATH  Sets the root path where reflection filenames in \n"
    "                         reflection.fbs are relative to. The 'root' is denoted with \n"
    "                         `//`. E.g. if PATH=/a/b/c \n then /a/d/e.fbs will be serialized\n"
    "                         as //../d/e.fbs. (PATH defaults to the directory of the first\n"
    "                         provided schema file.)\n"
    "  --bfbs-comments        Add doc comments to the binary schema files.\n"
    "  --bfbs-builtins        Add builtin attributes to the binary schema files.\n"
    "  --bfbs-gen-embed       Generate code to embed the bfbs schema to the source.\n"
    "  --conform FILE         Specify a schema the following schemas should be\n"
    "                         an evolution of. Gives errors if not.\n"
    "  --conform-includes     Include path for the schema given with --conform PATH\n"
    "  --filename-suffix      The suffix appended to the generated file names.\n"
    "                         Default is '_generated'.\n"
    "  --filename-ext         The extension appended to the generated file names.\n"
    "                         Default is language-specific (e.g., '.h' for C++)\n"
    "  --include-prefix       Prefix this path to any generated include statements.\n"
    "    PATH\n"
    "  --keep-prefix          Keep original prefix of schema include statement.\n"
    "  --reflect-types        Add minimal type reflection to code generation.\n"
    "  --reflect-names        Add minimal type/name reflection.\n"
    "  --root-type T          Select or override the default root_type\n"
    "  --require-explicit-ids When parsing schemas, require explicit ids (id: x).\n"
    "  --force-defaults       Emit default values in binary output from JSON\n"
    "  --force-empty          When serializing from object API representation,\n"
    "                         force strings and vectors to empty rather than null.\n"
    "  --force-empty-vectors  When serializing from object API representation,\n"
    "                         force vectors to empty rather than null.\n"
    "  --flexbuffers          Used with \"binary\" and \"json\" options, it generates\n"
    "                         data using schema-less FlexBuffers.\n"
    "  --no-warnings          Inhibit all warning messages.\n"
    "  --cs-global-alias      Prepend \"global::\" to all user generated csharp classes and structs.\n"
    "FILEs may be schemas (must end in .fbs), binary schemas (must end in .bfbs),\n"
    "or JSON files (conforming to preceding schema). FILEs after the -- must be\n"
    "binary flatbuffer format files.\n"
    "Output files are named using the base file name of the input,\n"
    "and written to the current directory or the path given by -o.\n"
    "example: " << program_name << " -c -b schema1.fbs schema2.fbs data.json\n";
  // 12345678901234567890123456789012345678901234567890123456789012345678901234567890
  // clang-format on
  return ss.str();
}

int FlatCompiler::Compile(int argc, const char **argv) {
  if (params_.generators == nullptr || params_.num_generators == 0) {
    return 0;
  }

  flatbuffers::IDLOptions opts;
  std::string output_path;

  bool any_generator = false;
  bool print_make_rules = false;
  bool raw_binary = false;
  bool schema_binary = false;
  bool grpc_enabled = false;
  bool requires_bfbs = false;
  std::vector<std::string> filenames;
  std::list<std::string> include_directories_storage;
  std::vector<const char *> include_directories;
  std::vector<const char *> conform_include_directories;
  std::vector<bool> generator_enabled(params_.num_generators, false);
  size_t binary_files_from = std::numeric_limits<size_t>::max();
  std::string conform_to_schema;

  for (int argi = 0; argi < argc; argi++) {
    std::string arg = argv[argi];
    if (arg[0] == '-') {
      if (filenames.size() && arg[1] != '-')
        Error("invalid option location: " + arg, true);
      if (arg == "-o") {
        if (++argi >= argc) Error("missing path following: " + arg, true);
        output_path = flatbuffers::ConCatPathFileName(
            flatbuffers::PosixPath(argv[argi]), "");
      } else if (arg == "-I") {
        if (++argi >= argc) Error("missing path following: " + arg, true);
        include_directories_storage.push_back(
            flatbuffers::PosixPath(argv[argi]));
        include_directories.push_back(
            include_directories_storage.back().c_str());
      } else if (arg == "--bfbs-filenames") {
        if (++argi > argc) Error("missing path following: " + arg, true);
        opts.project_root = argv[argi];
        if (!DirExists(opts.project_root.c_str()))
          Error(arg + " is not a directory: " + opts.project_root);
      } else if (arg == "--conform") {
        if (++argi >= argc) Error("missing path following: " + arg, true);
        conform_to_schema = flatbuffers::PosixPath(argv[argi]);
      } else if (arg == "--conform-includes") {
        if (++argi >= argc) Error("missing path following: " + arg, true);
        include_directories_storage.push_back(
            flatbuffers::PosixPath(argv[argi]));
        conform_include_directories.push_back(
            include_directories_storage.back().c_str());
      } else if (arg == "--include-prefix") {
        if (++argi >= argc) Error("missing path following: " + arg, true);
        opts.include_prefix = flatbuffers::ConCatPathFileName(
            flatbuffers::PosixPath(argv[argi]), "");
      } else if (arg == "--keep-prefix") {
        opts.keep_include_path = true;
      } else if (arg == "--strict-json") {
        opts.strict_json = true;
      } else if (arg == "--allow-non-utf8") {
        opts.allow_non_utf8 = true;
      } else if (arg == "--natural-utf8") {
        opts.natural_utf8 = true;
      } else if (arg == "--go-namespace") {
        if (++argi >= argc) Error("missing golang namespace" + arg, true);
        opts.go_namespace = argv[argi];
      } else if (arg == "--go-import") {
        if (++argi >= argc) Error("missing golang import" + arg, true);
        opts.go_import = argv[argi];
      } else if (arg == "--defaults-json") {
        opts.output_default_scalars_in_json = true;
      } else if (arg == "--unknown-json") {
        opts.skip_unexpected_fields_in_json = true;
      } else if (arg == "--no-prefix") {
        opts.prefixed_enums = false;
      } else if (arg == "--scoped-enums") {
        opts.prefixed_enums = false;
        opts.scoped_enums = true;
      } else if (arg == "--no-union-value-namespacing") {
        opts.union_value_namespacing = false;
      } else if (arg == "--gen-mutable") {
        opts.mutable_buffer = true;
      } else if (arg == "--gen-name-strings") {
        opts.generate_name_strings = true;
      } else if (arg == "--gen-object-api") {
        opts.generate_object_based_api = true;
      } else if (arg == "--gen-compare") {
        opts.gen_compare = true;
      } else if (arg == "--cpp-include") {
        if (++argi >= argc) Error("missing include following: " + arg, true);
        opts.cpp_includes.push_back(argv[argi]);
      } else if (arg == "--cpp-ptr-type") {
        if (++argi >= argc) Error("missing type following: " + arg, true);
        opts.cpp_object_api_pointer_type = argv[argi];
      } else if (arg == "--cpp-str-type") {
        if (++argi >= argc) Error("missing type following: " + arg, true);
        opts.cpp_object_api_string_type = argv[argi];
      } else if (arg == "--cpp-str-flex-ctor") {
        opts.cpp_object_api_string_flexible_constructor = true;
      } else if (arg == "--no-cpp-direct-copy") {
        opts.cpp_direct_copy = false;
      } else if (arg == "--cpp-field-case-style") {
        if (++argi >= argc) Error("missing case style following: " + arg, true);
        if (!strcmp(argv[argi], "unchanged"))
          opts.cpp_object_api_field_case_style =
              IDLOptions::CaseStyle_Unchanged;
        else if (!strcmp(argv[argi], "upper"))
          opts.cpp_object_api_field_case_style = IDLOptions::CaseStyle_Upper;
        else if (!strcmp(argv[argi], "lower"))
          opts.cpp_object_api_field_case_style = IDLOptions::CaseStyle_Lower;
        else
          Error("unknown case style: " + std::string(argv[argi]), true);
      } else if (arg == "--gen-nullable") {
        opts.gen_nullable = true;
      } else if (arg == "--java-checkerframework") {
        opts.java_checkerframework = true;
      } else if (arg == "--gen-generated") {
        opts.gen_generated = true;
      } else if (arg == "--gen-json-emit") {
        opts.gen_json_coders = true;
      } else if (arg == "--object-prefix") {
        if (++argi >= argc) Error("missing prefix following: " + arg, true);
        opts.object_prefix = argv[argi];
      } else if (arg == "--object-suffix") {
        if (++argi >= argc) Error("missing suffix following: " + arg, true);
        opts.object_suffix = argv[argi];
      } else if (arg == "--gen-all") {
        opts.generate_all = true;
        opts.include_dependence_headers = false;
      } else if (arg == "--gen-includes") {
        // Deprecated, remove this option some time in the future.
        Warn("warning: --gen-includes is deprecated (it is now default)\n");
      } else if (arg == "--no-includes") {
        opts.include_dependence_headers = false;
      } else if (arg == "--gen-onefile") {
        opts.one_file = true;
      } else if (arg == "--raw-binary") {
        raw_binary = true;
      } else if (arg == "--size-prefixed") {
        opts.size_prefixed = true;
      } else if (arg == "--") {  // Separator between text and binary inputs.
        binary_files_from = filenames.size();
      } else if (arg == "--proto") {
        opts.proto_mode = true;
      } else if (arg == "--proto-namespace-suffix") {
        if (++argi >= argc) Error("missing namespace suffix" + arg, true);
        opts.proto_namespace_suffix = argv[argi];
      } else if (arg == "--oneof-union") {
        opts.proto_oneof_union = true;
      } else if (arg == "--schema") {
        schema_binary = true;
      } else if (arg == "-M") {
        print_make_rules = true;
      } else if (arg == "--version") {
        printf("flatc version %s\n", FLATC_VERSION());
        exit(0);
      } else if (arg == "--grpc") {
        grpc_enabled = true;
      } else if (arg == "--bfbs-comments") {
        opts.binary_schema_comments = true;
      } else if (arg == "--bfbs-builtins") {
        opts.binary_schema_builtins = true;
      } else if (arg == "--bfbs-gen-embed") {
        opts.binary_schema_gen_embed = true;
      } else if (arg == "--reflect-types") {
        opts.mini_reflect = IDLOptions::kTypes;
      } else if (arg == "--reflect-names") {
        opts.mini_reflect = IDLOptions::kTypesAndNames;
      } else if (arg == "--require-explicit-ids") {
        opts.require_explicit_ids = true;
      } else if (arg == "--root-type") {
        if (++argi >= argc) Error("missing type following: " + arg, true);
        opts.root_type = argv[argi];
      } else if (arg == "--filename-suffix") {
        if (++argi >= argc) Error("missing filename suffix: " + arg, true);
        opts.filename_suffix = argv[argi];
      } else if (arg == "--filename-ext") {
        if (++argi >= argc) Error("missing filename extension: " + arg, true);
        opts.filename_extension = argv[argi];
      } else if (arg == "--force-defaults") {
        opts.force_defaults = true;
      } else if (arg == "--force-empty") {
        opts.set_empty_strings_to_null = false;
        opts.set_empty_vectors_to_null = false;
      } else if (arg == "--force-empty-vectors") {
        opts.set_empty_vectors_to_null = false;
      } else if (arg == "--java-primitive-has-method") {
        opts.java_primitive_has_method = true;
      } else if (arg == "--cs-gen-json-serializer") {
        opts.cs_gen_json_serializer = true;
      } else if (arg == "--flexbuffers") {
        opts.use_flexbuffers = true;
      } else if (arg == "--gen-jvmstatic") {
        opts.gen_jvmstatic = true;
      } else if (arg == "--no-warnings") {
        opts.no_warnings = true;
      } else if (arg == "--cpp-std") {
        if (++argi >= argc)
          Error("missing C++ standard specification" + arg, true);
        opts.cpp_std = argv[argi];
      } else if (arg.rfind("--cpp-std=", 0) == 0) {
        opts.cpp_std = arg.substr(std::string("--cpp-std=").size());
      } else if (arg == "--cpp-static-reflection") {
        opts.cpp_static_reflection = true;
      } else if (arg == "--cs-global-alias") {
        opts.cs_global_alias = true;
      } else {
        for (size_t i = 0; i < params_.num_generators; ++i) {
          if (arg == params_.generators[i].generator_opt_long ||
              (params_.generators[i].generator_opt_short &&
               arg == params_.generators[i].generator_opt_short)) {
            generator_enabled[i] = true;
            any_generator = true;
            opts.lang_to_generate |= params_.generators[i].lang;
            if (params_.generators[i].bfbs_generator) {
              opts.binary_schema_comments = true;
              requires_bfbs = true;
            }
            goto found;
          }
        }
        Error("unknown commandline argument: " + arg, true);

      found:;
      }
    } else {
      filenames.push_back(flatbuffers::PosixPath(argv[argi]));
    }
  }

  if (!filenames.size()) Error("missing input files", false, true);

  if (opts.proto_mode) {
    if (any_generator)
      Error("cannot generate code directly from .proto files", true);
  } else if (!any_generator && conform_to_schema.empty()) {
    Error("no options: specify at least one generator.", true);
  }

  flatbuffers::Parser conform_parser;
  if (!conform_to_schema.empty()) {
    std::string contents;
    if (!flatbuffers::LoadFile(conform_to_schema.c_str(), true, &contents))
      Error("unable to load schema: " + conform_to_schema);

    if (flatbuffers::GetExtension(conform_to_schema) ==
        reflection::SchemaExtension()) {
      LoadBinarySchema(conform_parser, conform_to_schema, contents);
    } else {
      ParseFile(conform_parser, conform_to_schema, contents,
                conform_include_directories);
    }
  }

  std::unique_ptr<flatbuffers::Parser> parser(new flatbuffers::Parser(opts));

  for (auto file_it = filenames.begin(); file_it != filenames.end();
       ++file_it) {
    auto &filename = *file_it;
    std::string contents;
    if (!flatbuffers::LoadFile(filename.c_str(), true, &contents))
      Error("unable to load file: " + filename);

    bool is_binary =
        static_cast<size_t>(file_it - filenames.begin()) >= binary_files_from;
    auto ext = flatbuffers::GetExtension(filename);
    const bool is_schema = ext == "fbs" || ext == "proto";
    if (is_schema && opts.project_root.empty()) {
      opts.project_root = StripFileName(filename);
    }
    const bool is_binary_schema = ext == reflection::SchemaExtension();
    if (is_binary) {
      parser->builder_.Clear();
      parser->builder_.PushFlatBuffer(
          reinterpret_cast<const uint8_t *>(contents.c_str()),
          contents.length());
      if (!raw_binary) {
        // Generally reading binaries that do not correspond to the schema
        // will crash, and sadly there's no way around that when the binary
        // does not contain a file identifier.
        // We'd expect that typically any binary used as a file would have
        // such an identifier, so by default we require them to match.
        if (!parser->file_identifier_.length()) {
          Error("current schema has no file_identifier: cannot test if \"" +
                filename +
                "\" matches the schema, use --raw-binary to read this file"
                " anyway.");
        } else if (!flatbuffers::BufferHasIdentifier(
                       contents.c_str(), parser->file_identifier_.c_str(),
                       opts.size_prefixed)) {
          Error("binary \"" + filename +
                "\" does not have expected file_identifier \"" +
                parser->file_identifier_ +
                "\", use --raw-binary to read this file anyway.");
        }
      }
    } else {
      // Check if file contains 0 bytes.
      if (!opts.use_flexbuffers && !is_binary_schema &&
          contents.length() != strlen(contents.c_str())) {
        Error("input file appears to be binary: " + filename, true);
      }
      if (is_schema || is_binary_schema) {
        // If we're processing multiple schemas, make sure to start each
        // one from scratch. If it depends on previous schemas it must do
        // so explicitly using an include.
        parser.reset(new flatbuffers::Parser(opts));
      }
      // Try to parse the file contents (binary schema/flexbuffer/textual
      // schema)
      if (is_binary_schema) {
        LoadBinarySchema(*parser.get(), filename, contents);
      } else if (opts.use_flexbuffers) {
        if (opts.lang_to_generate == IDLOptions::kJson) {
          parser->flex_root_ = flexbuffers::GetRoot(
              reinterpret_cast<const uint8_t *>(contents.c_str()),
              contents.size());
        } else {
          parser->flex_builder_.Clear();
          ParseFile(*parser.get(), filename, contents, include_directories);
        }
      } else {
        ParseFile(*parser.get(), filename, contents, include_directories);
        if (!is_schema && !parser->builder_.GetSize()) {
          // If a file doesn't end in .fbs, it must be json/binary. Ensure we
          // didn't just parse a schema with a different extension.
          Error("input file is neither json nor a .fbs (schema) file: " +
                    filename,
                true);
        }
      }
      if ((is_schema || is_binary_schema) && !conform_to_schema.empty()) {
        auto err = parser->ConformTo(conform_parser);
        if (!err.empty()) Error("schemas don\'t conform: " + err, false);
      }
      if (schema_binary || opts.binary_schema_gen_embed) {
        parser->Serialize();
      }
      if (schema_binary) {
        parser->file_extension_ = reflection::SchemaExtension();
      }
    }
    std::string filebase =
        flatbuffers::StripPath(flatbuffers::StripExtension(filename));

    // If one of the generators uses bfbs, serialize the parser and get
    // the serialized buffer and length.
    const uint8_t *bfbs_buffer = nullptr;
    int64_t bfbs_length = 0;
    if (requires_bfbs) {
      parser->Serialize();
      bfbs_buffer = parser->builder_.GetBufferPointer();
      bfbs_length = parser->builder_.GetSize();
    }

    for (size_t i = 0; i < params_.num_generators; ++i) {
      if (generator_enabled[i]) {
        if (!print_make_rules) {
          flatbuffers::EnsureDirExists(output_path);

          // Prefer bfbs generators if present.
          if (params_.generators[i].bfbs_generator) {
            const GeneratorStatus status =
                params_.generators[i].bfbs_generator->Generate(bfbs_buffer,
                                                               bfbs_length);
            if (status != OK) {
              Error(std::string("Unable to generate ") +
                    params_.generators[i].lang_name + " for " + filebase +
                    " using bfbs generator.");
            }
          } else {
            if ((!params_.generators[i].schema_only ||
                 (is_schema || is_binary_schema)) &&
                !params_.generators[i].generate(*parser.get(), output_path,
                                                filebase)) {
              Error(std::string("Unable to generate ") +
                    params_.generators[i].lang_name + " for " + filebase);
            }
          }
        } else {
          if (params_.generators[i].make_rule == nullptr) {
            Error(std::string("Cannot generate make rule for ") +
                  params_.generators[i].lang_name);
          } else {
            std::string make_rule = params_.generators[i].make_rule(
                *parser.get(), output_path, filename);
            if (!make_rule.empty())
              printf("%s\n",
                     flatbuffers::WordWrap(make_rule, 80, " ", " \\").c_str());
          }
        }
        if (grpc_enabled) {
          if (params_.generators[i].generateGRPC != nullptr) {
            if (!params_.generators[i].generateGRPC(*parser.get(), output_path,
                                                    filebase)) {
              Error(std::string("Unable to generate GRPC interface for") +
                    params_.generators[i].lang_name);
            }
          } else {
            Warn(std::string("GRPC interface generator not implemented for ") +
                 params_.generators[i].lang_name);
          }
        }
      }
    }

    if (!opts.root_type.empty()) {
      if (!parser->SetRootType(opts.root_type.c_str()))
        Error("unknown root type: " + opts.root_type);
      else if (parser->root_struct_def_->fixed)
        Error("root type must be a table");
    }

    if (opts.proto_mode) GenerateFBS(*parser.get(), output_path, filebase);

    // We do not want to generate code for the definitions in this file
    // in any files coming up next.
    parser->MarkGenerated();
  }
  if (opts.lang_to_generate & IDLOptions::kRust && !parser->opts.one_file) {
    GenerateRustModuleRootFile(*parser, output_path);
  }
  return 0;
}

}  // namespace flatbuffers
